1950 - NO SYMPOSIUM 1951 TENTH SYMPOSIUM Viktor Hamburger, President Richard H. Goodwin, Secretary Lindsay M. Black, Treasurer Elmer G. Butler Edward W. Shrigley Ralph H. Wetmore 1952 ELEVENTH SYMPOSIUM E.G. Butler, President Richard H. Goodwin, Secretary Louis G. Nickell, Treasurer E.J. Boell Viktor Hamburger Ralph H. Wetmore 1953 TWELFTH SYMPOSIUM E.J. Boell, President Richard H. Goodwin, Secretary Louis G. Nickell, Treasurer E.G. Butler David R. Goddard Victor C. Twitty 1954 THIRTEENTH SYMPOSIUM David R. Goddard, President Mac V. Edds, Jr., Secretary Louis G. Nickell, Treasurer E.G. Boell John T. Bonner Victor.C. Twitty 1955 FOURTEENTH SYMPOSIUM Victor C. Twitty, President Mac V. Edds, Jr., Secretary Robert W. Briggs, Treasurer John Tyler Bonner Harriet B. Creighton David R. Goddard

1956 FIFTEENTH SYMPOSIUM Kenneth V. Thimann, President Mac V. Edds, Jr., Secretary Robert W. Briggs, Treasurer John Tyler Bonner Harriet B. Creighton James D. Ebert 1957 SIXTEENTH SYMPOSIUM Gerhard Frankhauser, President Ralph O. Erickson, Secretary Robert W. Briggs, Treasurer Dorothea Rudnick, Editor Harriet B. Creighton James D. Ebert Kenneth V. Thimann 1958 SEVENTEENTH SYMPOSIUM James D. Ebert, President Ralph O. Erickson, Secretary Edgar Zwilling, Treasurer Dorothea Rudnick, Editor Gerhard Frankhauser Folke K. Skoog Kenneth V. Thimann 1959 EIGHTEENTH SYMPOSIUM Ralph O. Erickson, President William R. Jacobs, Secretary Edgar Zwilling, Treasurer Dorothea Rudnick, Editor Dietrich Bodenstein Gerhard Frankhauser Folke K. Skoog

1939	1940-1949	About SDB	1960-1969
1970-1979	1980-1989	1990-1999	2000-2001